<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script>

function boom()
{
  document.documentElement.style.fontStyle = "oblique";
  var c = document.getElementById("c");
  c.parentNode.removeChild(c);
}

</script>
</head>
<body onload="boom();"><math xmlns="http://www.w3.org/1998/Math/MathML"><frameset xmlns="http://www.w3.org/1999/xhtml"></frameset><msubsup id="c"/><mo><frameset xmlns="http://www.w3.org/1999/xhtml"></frameset></mo></math>x</body>
</html>
